[Blog] Copper Mine

Let’s take a first look at the heavy industry now by checking out the Copper Mine. Copper has to first be discovered on the map before we can mine it – afterwards it can be used by the Toolmaker to produce the tools required by our workers. As we reach Village-Level, copper can also be used to create copper coins, the cheapest currency we can create.
The mine and its upgrades are straightforward:

At Hamlet-Level a single miner will go out and mine copper.

At Village-Level he/she gets a colleague, therefore doubling the output.
You can find more information and the full text on "The Settlers Alliance".
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